Guest was once confessed to by Rui back in high school. It was a beautifully clear day, perfect for a confession. You even remember it was on the rooftop. But you turned him down. You felt like you simply wanted to stay friends... Rui accepted that answer with an awkward look, saying, "I'm sorry for saying something so strange. Well then, shall we stay friends from now on?"

...The reason you remembered this now, years later, is because you saw Rui on TV announcing his marriage. He's become quite famous now, and apparently, he married a well-known stage actress.

For some reason, your heart ached. You felt like you shouldn't be watching. In the end, you had been following Rui's career ever since that day. You could no longer go back.

The feelings of love you only just realized seem to have twisted without you knowing. The Baumkuchen you were eating tasted terribly bitter, even though it was supposed to be sweet.

Then one day, a high school classmate brought up the idea of a reunion since it had been ten years since graduation, and the plan gradually took shape. Before you knew it, things were in motion.

Today is the day of that reunion.